$100+ Cheap flights from South Dakota to Illinois
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from South Dakota to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from South Dakota to Illinois
Keep the following information in mind while searching for South Dakota to Illinois flight deals. Data was last updated June 12, 2025.
Round-trip from | $189 (United Airlines) |
|---|---|
One-way from | $100 (Delta) |
Popular in | March |
Cheapest in | January |
Average price | $364 |
Good round-trip deal | $194 or less |
Good one-way deal | $103 or less |
Find flight deals from South Dakota to Illinois
Cheapest flights from South Dakota to IllinoisExplore the most affordable flight options available from South Dakota to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.
Explore the most affordable flight options available from South Dakota to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Mytrip deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Frontier deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cheapflights Fare Finder
Customize your flight search to find flights from South Dakota to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from South Dakota to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Sioux FallsChicago
FSD - ORD
FSDORD
Sioux Falls Joe Foss Field
Sat 9/6
6:11 pm-8:10 pm
Nonstop1h 59m
Chicago O'Hare Intl
Tue 9/9
8:20 pm-10:12 pm
Nonstop1h 52m
Rapid CityChicago
RAP - ORD
RAPORD
Rapid City
Thu 7/10
6:01 pm-9:18 pm
Nonstop2h 17m
Chicago O'Hare Intl
Mon 7/14
4:13 pm-5:31 pm
Nonstop2h 18m
Rapid CityChicago
RAP - ORD
RAPORD
Rapid City
Fri 7/4
1:43 pm-5:03 pm
Nonstop2h 20m
Chicago O'Hare Intl
Sun 7/6
8:45 am-10:20 am
Nonstop2h 35m
Sioux FallsChicago
FSD - MDW
FSDMDW
Sioux Falls Joe Foss Field
Tue 8/19
12:56 pm-5:37 pm
1 stop4h 41m
Chicago Midway
Tue 8/26
4:25 pm-11:06 pm
1 stop6h 41m
Sioux FallsChicago
FSD - ORD
FSDORD
Sioux Falls Joe Foss Field
Thu 8/21
5:00 am-8:24 am
1 stop3h 24m
Chicago O'Hare Intl
Sun 8/24
6:10 am-12:16 pm
1 stop6h 06m
Sioux FallsChicago
FSD - ORD
FSDORD
Sioux Falls Joe Foss Field
Thu 8/21
6:00 am-7:46 am
Nonstop1h 46m
Chicago O'Hare Intl
Sun 8/24
6:00 am-12:58 pm
1 stop6h 58m
Rapid CityChicago
RAP - ORD
RAPORD
Rapid City
Sat 11/15
10:40 am-4:47 pm
1 stop5h 07m
Chicago O'Hare Intl
Sat 1/10
3:50 pm-10:14 pm
1 stop7h 24m
Sioux FallsChicago
FSD - ORD
FSDORD
Sioux Falls Joe Foss Field
Fri 7/18
8:06 pm-11:27 pm
2 stops27h 21m
Chicago O'Hare Intl
Tue 7/22
7:08 am-12:52 pm
1 stop29h 44m
Sioux FallsSt. Louis
FSD - STL
FSDSTL
Sioux Falls Joe Foss Field
Fri 6/27
6:49 pm-11:59 pm
1 stop5h 10m
Lambert-St Louis
Tue 7/1
5:15 am-10:42 am
1 stop5h 27m
Sioux FallsSt. Louis
FSD - STL
FSDSTL
Sioux Falls Joe Foss Field
Tue 7/1
6:00 am-10:33 am
1 stop4h 33m
Lambert-St Louis
Sun 7/6
6:30 am-10:14 am
1 stop3h 44m
Best time to book a flight from South Dakota to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from South Dakota with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from South Dakota to Illinois
What is the cheapest month to book a flight from South Dakota to Illinois?
Currently, August is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $245). Flying from South Dakota to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from SD to IL?
Find hourly flight availability from South Dakota to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.
When flying from South Dakota to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Weekly flight availability from South Dakota to Illinois
Explore weekly flight availability from South Dakota to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 12, 2025.
The most flights from USSD to USIL are scheduled on a Thursday (18 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 on average).
Rainfall in Illinois by month
Plan your trip to Illinois by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.
Temperature in Illinois by month
Plan your trip to Illinois by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated June 12, 2025.
Get a feel of what it's like to fly with Delta, United Airlines and Allegiant Air from South Dakota to Illinois by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Related info for your journey
Find useful and relevant information for your journey from South Dakota to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for South Dakota to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Top 4 airlines flying from South Dakota to Illinois
Discover the top 4 airlines that operate flights from South Dakota to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$160 | Average$194 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$179 | Average$268 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$194 | Average$316 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$208 | Average$306 | FlexibilityNo cancel fee | On-timeN/A |